Heat capacity (C) and entropy of olivine-type LiFePO4 in the temperature range (2 to 773) K
| Autor: | Jürgen Seidel, Stefan Loos, Mahmoud Abdel-Hafiez, Florian Mertens, Klaus Bohmhammel, Regina Hüttl, D. Gruner, Anja U. B. Wolter |
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| Rok vydání: | 2015 |
| Předmět: |
Olivine
Chemistry Phonon Lithium iron phosphate Thermodynamics Atmospheric temperature range engineering.material Heat capacity Atomic and Molecular Physics and Optics Physical property Entropy (classical thermodynamics) chemistry.chemical_compound engineering Antiferromagnetism General Materials Science Physical and Theoretical Chemistry |
| Zdroj: | The Journal of Chemical Thermodynamics. 85:77-85 |
| ISSN: | 0021-9614 |
| Popis: | The heat capacity of olivine-type lithium iron phosphate (LiFePO4 – LFP) has been measured covering a temperature range from (2 to 773) K. Three different calorimeters were used. The Physical Property Measurement System (PPMS) from Quantum Design was applied in the range between T = (2 and 300) K, a Micro-DSC II from Setaram within the range between T = (283 and 353) K and data between T = (278 and 773) K were measured by means of a Sensys DSC (Setaram) using the Cp-by-step method. Experimental data are given with an error of (1 to 2)% above T = 20 K and up to 8% below 20 K. The data were subdivided into appropriate temperature intervals and fitted using common heat capacity functions. The low temperature results permit the calculation of standard entropies and temperature coefficients of electronic, lattice, as well as magnetic (antiferromagnetic transition at T = 49.2 K) contributions to the heat capacity. The obtained experimental values were compared to results of a recently published first principles phonon study (DFT) and to few available experimental data from the literature. |
| Databáze: | OpenAIRE |
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